JP2016082568A - Acoustic system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic system which is installed to a space above a listener, in which the acoustic system is less likely to be an obstacle, without causing damage to an interior part of a room.SOLUTION: An acoustic system includes: a planar speaker 210 which outputs a sound wave having directivity; a frame 220 supporting the speaker 210; and a support part 230 which is movably fixed to a space having a floor 110 and supports the frame 220. The support part 230 supports the frame 220 so that the speaker 210 outputs the sound wave toward the floor 110.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an acoustic system. In particular, the present invention relates to an acoustic system that is movably installed.

  Conventionally, in a silencer in which a performance sound is heard only by a player (listener) such as an electric violin, an electric guitar, or a mutable electronic piano that does not have a resonance body that resonates vibration generated by a string, headphones are used. It was necessary to wear and play. However, when the headphones are worn for a long time, the listener may feel uncomfortable because the headphones press on the ear or the head, and sometimes the listener may feel pain. In addition, when listening to performance sounds through headphones, the sound is transmitted directly from the ears and head, and thus sounds different from the sounds that are transmitted through space like actual performance sounds.

  As described above, an acoustic system has been developed that allows only the listener to listen to the performance sound without the listener wearing the headphones. For example, Patent Document 1 discloses an acoustic system that transmits a performance sound only to a listener by installing a planar speaker having directivity that goes straight in a lateral direction of the listener.

JP 2011-215187 A

  However, since the speaker is fixed to the wall in the acoustic system described in Patent Document 1, the listener can listen only in a limited area of the room where the acoustic system is installed. Therefore, it was necessary to decide where to play in accordance with the audible area. In addition, when moving in a room or performing in another room, it is necessary to install an acoustic system mounting jig in the room, which may damage the interior of the room. There was a problem.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an acoustic system that can be installed on an upper part of a listener that is not disturbed without damaging the interior of a room.

  An acoustic system according to an embodiment of the present invention includes a planar speaker that outputs sound waves having directivity, a frame that supports the speaker, and a support unit that is movably fixed in a space having a floor and supports the frame. The support unit supports the frame so that the speaker outputs sound waves toward the floor.

  The acoustic system according to the present invention can be installed on the upper part of the listener who is not disturbed without damaging the interior of the room.

It is a perspective view showing the whole acoustic system composition concerning Embodiment 1 of the present invention. It is sectional drawing which looked at the acoustic system which concerns on Embodiment 1 of this invention from the direction of A of FIG. It is the side view which looked at the acoustic system which concerns on Embodiment 1 of this invention from the direction of B of FIG. It is a functional block diagram which shows the function of the acoustic system which concerns on Embodiment 1 of this invention. It is sectional drawing of the acoustic system which concerns on the modification of Embodiment 1 of this invention. It is sectional drawing of the acoustic system which concerns on Embodiment 2 of this invention. It is sectional drawing of the acoustic system which concerns on the modification of Embodiment 2 of this invention. It is sectional drawing of the acoustic system which concerns on Embodiment 3 of this invention. It is sectional drawing of the acoustic system which concerns on Embodiment 4 of this invention. It is sectional drawing of the acoustic system which concerns on Embodiment 5 of this invention. It is sectional drawing of the acoustic system which concerns on the modification of Embodiment 5 of this invention. It is sectional drawing of the acoustic system which concerns on Embodiment 6 of this invention. It is a perspective view which shows the structure of the speaker in the acoustic system which concerns on Embodiment 6 of this invention. It is sectional drawing of the acoustic system which concerns on the modification of Embodiment 6 of this invention. It is a perspective view which shows the structure of the speaker in the acoustic system which concerns on the modification of Embodiment 6 of this invention. It is sectional drawing of the acoustic system which concerns on the modification of Embodiment 6 of this invention. It is a perspective view which shows the structure of the speaker in the acoustic system which concerns on the modification of Embodiment 6 of this invention. It is a figure which shows the outline | summary of the evaluation sample shape of the Example of this invention. It is a figure explaining the evaluation method of the Example of this invention. It is a figure which shows the evaluation result of the Example of this invention. It is a figure which shows the evaluation result of the Example of this invention. It is a figure which shows the simulation result of the Example of this invention. It is a figure which shows the simulation result of the Example of this invention.

  Hereinafter, an acoustic system according to the present invention will be described with reference to the drawings. However, the acoustic system of the present invention can be implemented in many different modes, and is not construed as being limited to the description of the embodiments described below. Note that in the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals, and repetitive description thereof is omitted.

<Embodiment 1>
The outline | summary of the acoustic system which concerns on Embodiment 1 of this invention is demonstrated using FIG. 1 thru | or FIG. In FIG. 1 to FIG. 4, a planar planar speaker (planar) arranged above a performer (listener) who plays a silencer such as an electric violin and outputs a sound wave having directivity that goes straight toward the listener. An acoustic system having a speaker will be described.

[Configuration of Acoustic System 10]
FIG. 1 is a perspective view showing the overall configuration of an acoustic system according to Embodiment 1 of the present invention. In FIG. 1, the acoustic system 10 according to the first embodiment of the present invention is installed in a room 100 including a floor 110 and a ceiling 120. Here, the room 100 shown in FIG. 1 is surrounded by walls 130 on all sides, but the acoustic system 10 can also be used in a room where the walls 130 are not provided. As shown in FIG. 1, the acoustic system 10 includes a flat speaker 210 that outputs a sound wave 213 having directivity, a frame 220 that supports the flat speaker 210, and a movably fixed inside the room 100. And a support portion 230 that supports 220. Here, the support unit 230 supports the frame 220 so that the flat speaker 210 outputs sound waves 213 toward the floor 110. In FIG. 1, the support unit 230 is connected to the first support member 231 that supports the frame 220 and the first support member 231, and is installed between the floor 110 and the ceiling 120 to fix the acoustic system 10. Support member 232. The second support member 232 includes an upper pad 233 disposed at the upper end and a lower pad 234 disposed at the lower end. In FIG. 1, the second support member 232 is installed between the floor 110 and the ceiling 120, but the second support member 232 may be installed between the opposing walls 130. That is, the pads provided at both ends of the second support member 232 may be fixed to each surface of the opposing wall 130. Here, the flat speaker 210 is installed above the listener's head. In other words, the flat speaker 210 is arranged so that the listener is located in the normal direction of the surface of the flat speaker 210. Further, a signal receiving device 240 including an amplifier is installed in the support unit 230. Here, the configuration in which the signal receiving device 240 is installed on the second support member 232 is exemplified, but the configuration is not limited to this configuration. For example, the signal receiving device 240 may be installed on the first support member 231. Good. Detailed structures and functions of these members will be described later.

  FIG. 1 illustrates an example in which a player (listener) 300 plays an electric violin 310. An electric violin is an electric musical instrument that uses an electronic circuit for an acoustic part, and is not provided with a resonance cylinder that resonates vibration generated by rubbing a string with a bow. Instead of resonating, the electric violin is provided with a signal transmission device 320 including a pickup that detects vibration and converts it into an electrical signal. In FIG. 1, the electric system according to the present invention will be described using an electric violin as an example. However, the present invention can also be applied to other silencers such as an electric guitar and an electronic piano. The acoustic system according to the present invention can also be applied to a device that outputs sound as an electrical signal.

  The detailed structure and function of each member included in the acoustic system 10 will be described with reference to FIG. 2 is a cross-sectional view of the acoustic system according to Embodiment 1 of the present invention as viewed from the direction A in FIG. As shown in FIG. 2, the flat speaker 210 is disposed on one surface side of the vibration unit 211 and the vibration unit 211 that generates sound waves, and blocks sound waves output from the one surface side of the vibration unit 211. And a sound insulating part 212. Here, the vibration part 211 is an electrostatic speaker and has a structure in which a sheet-like vibration film is sandwiched between a pair of planar electrodes. The vibration film of the vibration part 211 is made of a conductive film such as aluminum and operates by electrostatic force generated by applying a voltage to one of the pair of planar electrodes. An AC voltage having a certain frequency is applied to the pair of planar electrodes, and the vibrating membrane vibrates at the frequency, whereby sound waves are output. In such a vibrating section 211, the output sound wave has a planar wavefront. Accordingly, the sound wave 213 output from the vibration unit 211 has strong directivity in the normal direction 214 of the surface of the vibration film. The frequency band of the sound wave output from the vibration unit 211 is determined according to the size and shape of the vibration film. For example, in order to output the lowest sound (196 Hz) in the violin range, the size of the vibration part 211 is required to be at least B2 size (515 × 728 mm), preferably A0 size (841 × 1189 mm). It is good to be above. Here, in the vibration part 211, an insulating layer may be provided between the vibration film and the pair of planar electrodes.

The frame 220 supports the vibration part 211 and the sound insulation part 212 by supporting the outer peripheral ends of the vibration part 211 and the sound insulation part 212. The frame 220 may be supported so as to cover all of the outer peripheral ends of the vibration part 211 and the sound insulation part 212, or may support only a part of the outer peripheral ends of the vibration part 211 and the sound insulation part 212. . The frame 220 is provided with an opening 221 on the side opposite to the side on which the sound insulating part 212 of the vibration part 211 is disposed. The sound wave 213 generated by the vibration unit 211 is output to the outside of the frame 220 through the opening 221. In FIG. 2, the frame member is not provided at the center of the frame 220, but a frame member is provided at a part of the opening 221 of the flat speaker 210 for the purpose of improving the frame strength and improving the supporting force of the flat speaker 210. It may be provided. For example, a frame member may be provided in a lattice shape or a honeycomb shape in the opening 221 of the frame 220 in FIG. Of course, the shape of the frame member provided in the opening 221 of the frame 220 is not limited to these shapes, and may be various other shapes.

  Here, part or all of the planar speaker 210 and the frame 220 may have translucency. For example, a conductive resin or the like can be used as the vibration part 211 of the flat speaker 210. Further, a resin material with high translucency such as acrylic can be used for the frame 220. In addition, a hole or a notch that transmits light may be provided in part of the flat speaker 210 and the frame 220. By setting it as the above structures, it can suppress that the light of the illumination installed in the ceiling is interrupted | blocked by an acoustic system. As another configuration, a light source such as an LED or an organic EL may be disposed below the frame 220. With such a configuration, it is possible to compensate for illumination light blocked by the acoustic system and to provide more light to the listener.

  The first support member 231 of the support portion 230 includes a connection portion 236 that is connected to the frame 220 so as to be capable of rotational movement, and a connection portion 235 that is connected to the second support member 232 so as to be capable of rotational movement. The second support member 232 of the support unit 230 is fixed to the room 100 by expanding and contracting in the longitudinal direction of the second support member 232 and pressing the floor 110 and the ceiling 120. In other words, the support part 230 is fixed inside the room 100 by partially expanding and contracting. In other words, the support part 230 has an upper pad 233 (first fixing part) and a lower pad 234 (second fixing part), and the distance between the upper pad 233 and the lower pad 234 is variable. 233 is fixed to the ceiling 120 (first surface), and the lower pad 234 is fixed to the floor 110 (second surface). The structure that makes the distance between the first fixing part and the second fixing part variable can be realized by various structures. For example, a telescopic pipe structure such as an antenna or a baton, a shaft structure made of a rod-like member and having an expansion / contraction function, an outer shell structure having a monocoque / shell structure and an expansion / contraction function may be used. In FIG. 2, the configuration in which the upper pad 233 and the ceiling 120 are in contact with each other and the lower pad 234 and the floor 110 are in contact with each other is illustrated, but the upper pad 233 and the ceiling 120 or the lower pad 234 and the floor 110 are in contact with each other. Other structures may be sandwiched between them.

In FIG. 2, a state in which the first support member 231 is rotated about the connecting portion 235 is indicated by a two-dot chain line. The rotationally movable region of the first support member 231 includes a range where the surface of the flat speaker 210 and the surface of the floor 110 are parallel. In other words, the support unit 230 supports the frame 220 movably within a predetermined range including a range in which the surface of the flat speaker 210 and the surface of the floor 110 are parallel. Further, the first support member 231 and the second support member 232 can be made parallel when stored. In addition, the connection portion 235 of the first support member 231 may slide in the longitudinal direction of the second support member 232. Further, the distance between the connecting portion 235 and the frame 220 may be variable. Further, the first support member 231 and the frame 220 may rotate about the second support member 232 as an axis. However, the first support member 231 does not necessarily need to rotate and may be fixed to the second support member 232, for example.
2 illustrates the configuration in which the first support member 231 and the second support member 232 are separate members. However, the configuration is not limited to this configuration. For example, the first support member 231 and the second support member 232 are integrated. May be formed. Here, the flat speaker 210 may be disposed parallel to the floor 110 or may be disposed at an inclination. At this time, the listener may be arranged so as to be positioned in the normal direction 214 of the surface of the flat speaker 210.

  In FIG. 2, the structure in which the sound insulation unit 212 is disposed above the vibration unit 211 is illustrated. However, the structure is not limited to this structure. For example, the frame 220 disposed above the vibration unit 211 has a sound insulation function. If the ceiling 120 has a sound insulation function, the sound insulation unit 212 may not be provided if there is no problem in use even if sound waves are output upward.

  FIG. 3 is a side view of the acoustic system according to the first embodiment of the present invention viewed from the direction B in FIG. As shown in FIG. 3, the frame 220 is supported by the first support member 231 so as to be rotatable about the connection portion 236. In FIG. 3, a state in which the frame 220 is rotated about the connection portion 236 is indicated by a two-dot chain line. Here, the rotationally movable region of the flat speaker 210 and the frame 220 includes a range in which the surface of the flat speaker 210 and the surface of the floor 110 are parallel. In other words, the support unit 230 supports the frame 220 movably within a predetermined range including a range in which the surface of the flat speaker 210 and the surface of the floor 110 are parallel. Further, the first support member 231 and the second support member 232 can be made parallel when stored. However, the planar speaker 210 and the frame 220 are not necessarily rotated and may be fixed to the first support member 231, for example. Here, the flat speaker 210 may be arranged parallel to the floor 110 or may be inclined so that the listener is located in the normal direction 214 of the surface of the flat speaker 210.

  The functions of the signal reception device 240 and the signal transmission device 320 will be described in detail with reference to FIG. FIG. 4 is a functional block diagram showing functions of the acoustic system according to Embodiment 1 of the present invention. FIG. 4 shows a functional block diagram of each of the signal receiving device 240 and the signal transmitting device 320. As shown in FIG. 4, the signal receiving device 240 includes an amplifier circuit 241, a D / A converter 242, and a communication unit 243 connected to the flat speaker 210. The signal transmission device 320 includes a pickup 321, an amplifier circuit 322, an A / D converter 323, and a communication unit 324. 1 and 4 exemplify the configuration in which the communication units 243 and 324 perform wireless communication with each other, the wired communication may be performed by connecting the communication units 243 and 324 with each other through wiring. In addition, FIG. 4 illustrates a configuration in which the played sound is digitally converted to perform digital communication. However, the present invention is not limited to this configuration. For example, the played sound is not converted into digital signals and analog communication is performed with analog signals. It is good also as a structure to perform. When performing analog communication, the signal transmission device 320 may include a carrier wave oscillation circuit or a modulation circuit instead of the A / D converter 323. When performing analog communication, the signal receiving device 240 may include a tuning circuit and a demodulation circuit instead of the D / A converter 242. Analog communication may be performed by frequency modulation (FM) or amplitude modulation (AM).

  Next, operations of the signal reception device 240 and the signal transmission device 320 will be described with reference to FIG. First, a sound played by a musical instrument is picked up by a pickup 321 and converted into an electric signal. The electric signal obtained by the conversion is amplified in amplitude by the amplifier circuit 322 and converted into a digital signal by the A / D converter 323. Then, the converted digital signal is transmitted from the communication unit 324 to the communication unit 243 by wireless communication. Next, the digital signal received by the communication unit 243 is converted into an analog signal by the D / A converter 242. After being converted to an analog signal, the amplitude is amplified by the amplifier circuit 241 and output from the flat speaker 210.

  Here, in the first embodiment, the configuration using the pickup as the member for collecting the sound of the musical instrument is exemplified, but the configuration is not limited to this configuration. For example, when a normal musical instrument that outputs sound by playing is used, a microphone may be used instead of the pickup. The microphone may be, for example, a stand-type microphone that can be installed in front of a listener, or a pin microphone that can be attached to a musical instrument. When these microphones are used, a circuit for suppressing howling may be further provided in the signal receiving device 240.

  As described above, according to the acoustic system according to Embodiment 1 of the present invention, it is possible to install the acoustic system on the upper part of the listener who is not disturbed without damaging the interior of the room. By installing an acoustic system above the listener, more natural instrument sounds can be provided. For example, in the case of a violin, it is possible to provide the listener with a sense of localization that is close to that when playing an acoustic violin by emitting sound from above the listener. In addition, since the speaker is difficult to enter the field of view, a sense of openness can be provided to the listener. In addition, since the flat speaker according to the present invention is lighter than the conventional cone type speaker, the flat speaker can be arranged above the listener by using a support portion having a light and simple structure. In addition, since the sound insulation unit 212 is disposed on the ceiling 120 side of the flat speaker 210, sound waves output from the vibration unit 211 toward the ceiling 120 can be blocked, thereby reducing the influence of reflection by the ceiling 120. It is possible to provide a listener with a more natural performance sound. Further, since the orientation of the flat speaker 210 is variable, the orientation of the flat speaker 210 can be finely adjusted to suit the listener without removing the sound system, and can be stored compactly when not in use. . Moreover, the signal receiving device 240 is separated from the flat speaker 210 and disposed near the floor 110 of the support unit 230, so that the member disposed above the listener can be further reduced in weight.

<Modification of Embodiment 1>
FIG. 5 is a cross-sectional view of an acoustic system according to a modification of the first embodiment of the present invention. As shown in FIG. 5, the support part 230 of the acoustic system 11 according to the modification of the first embodiment can be fixed to a surface parallel to the surface of the ceiling 120 even at a place other than the floor 110. In FIG. 5, the lower pad 234 may be disposed on a base 250 disposed on the floor 110. Here, the base 250 may be anything that can be stably arranged on the floor 110 such as a table, a chair, and a shelf. The upper surface of the base 250 (the surface facing the ceiling 120) is preferably substantially parallel to the ceiling 120, but may not be parallel as long as the support portion 230 can be fixed. Further, by making the upper pad 233 and the lower pad 234 movable, they can be attached even when the upper surface of the base 250 is not parallel to the ceiling 120. 5 illustrates the configuration in which the base 250 is disposed as a structure between the floor 110 and the lower pad 234, but the structure may be disposed between the ceiling 120 and the upper pad 233. In addition, a structure may be disposed both between the floor 110 and the lower pad 234 and between the ceiling 120 and the upper pad 233.

<Embodiment 2>
The outline of the acoustic system according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. In the second embodiment, an acoustic system in which an acoustic system is attached to a hanging rosette or a hanging ceiling to which lighting or the like can be attached will be described.

[Configuration of Acoustic System 20]
FIG. 6 is a cross-sectional view of an acoustic system according to Embodiment 2 of the present invention. In the acoustic system 20 shown in FIG. 6, the planar speaker 210 and the frame 220 can be the same as those in the acoustic system 10 shown in FIG. 2, and thus detailed description thereof is omitted here. In FIG. 6, the ceiling 120 is provided with a hook ceiling 260 that enables attachment of lighting and the like and supply of electrodes. A support portion 270 that supports the frame 220 is detachably attached to the hook ceiling 260. Here, the flat speaker 210 outputs sound waves by the electric power supplied from the hooking ceiling 260. More specifically, the signal receiving device 240 is fixed to the support portion 270, and sound waves are output from the flat speaker 210 when the signal receiving device 240 is operated by the power supplied from the hooking ceiling 260. That is, the support part 270 has a metal terminal (blade), inserts the blade into the hole (blade holder) of the hooking ceiling 260, twists in one direction, and fits the blade and the blade holder, The hook ceiling 260 and the support portion 270 are physically and electrically connected. Here, FIG. 6 illustrates the configuration in which the acoustic system 20 is attached to the hook ceiling 260, but the acoustic system 20 may be configured to be attached to the hook rosette. Further, in order to make the orientation of the flat speaker 210 and the frame 220 variable, the support part 270 may have a movable part.

  As described above, according to the sound system according to the second embodiment of the present invention, the sound system is attached using the equipment provided in advance in the room, so that the listener is not disturbed without damaging the inside of the room. An acoustic system can be installed on the top of the. By installing an acoustic system above the listener, more natural instrument sounds can be provided. Further, since the flat speaker 210 is attached so as to be able to supply electrodes from the hook ceiling 260, it is not necessary to prepare a separate power source. That is, it is possible to simultaneously attach the sound system and supply power.

<Modification of Embodiment 2>
FIG. 7 is a cross-sectional view of an acoustic system according to a modification of the second embodiment of the present invention. The acoustic system 21 illustrated in FIG. 7 is similar to the acoustic system 20 illustrated in FIG. 6, but the acoustic system 21 includes a duct rail 280 and a plurality of connectors 281 between the support portion 270 and the hook ceiling 260. The sound system 20 is different from the sound system 20 in that the support portion 270, the frame 220, and the flat speaker 210 are connected to each of the plurality of connectors 281.

  In the acoustic system 21 shown in FIG. 7, the planar speaker 210, the frame 220, and the signal receiving device 240 can be the same as those in the acoustic system 10 shown in FIG. In FIG. 7, the duct rail 280 has a metal terminal (blade), inserts the blade into the hole (blade holder) of the hooking ceiling 260, twists in one direction, and fits the blade and the blade holder. Thus, the hook ceiling 260 and the duct rail 280 are physically and electrically connected. Further, the plurality of connectors 281 are slidably connected to the duct rail 280, and power from the hooking ceiling 260 is supplied to the terminal portions provided in each connector 281. The support portion 270 that supports the frame 220 is detachably attached to the connector 281. The support portion 270 has a connection portion that can be attached to a terminal portion of the connector 281 and can supply electrodes. That is, by attaching the connection portion of the support portion 270 to the terminal portion of the connector 281, the support portion 270 and the connector 281 are physically and electrically connected. Here, FIG. 7 illustrates a configuration in which the acoustic system 21 is attached to the hook ceiling 260, but the acoustic system 20 may be configured to be attached to a hook rosette.

  In FIG. 7, the configuration in which different support portions 270 are attached to the plurality of connectors 281 is illustrated. However, the present invention is not limited to this configuration. For example, even in a configuration in which one support portion is attached to the plurality of connectors 281. Alternatively, a configuration in which one frame is supported by the plurality of support portions 270 may be employed. In this way, one support portion is attached to a plurality of connectors 281 or one frame is supported by a plurality of support portions, so that even a single large support portion or frame is stable. Can be fixed.

<Embodiment 3>
The outline | summary of the acoustic system which concerns on Embodiment 3 of this invention is demonstrated using FIG. In the third embodiment, an acoustic system including two planar speakers that output sound waves having directivity that go straight toward the listener above the listener, and stereo speakers that output different sounds from the speakers. Will be described.

[Configuration of Acoustic System 30]
FIG. 8 is a cross-sectional view of an acoustic system according to Embodiment 3 of the present invention. The acoustic system 30 illustrated in FIG. 8 is similar to the acoustic system 10 illustrated in FIG. 3, but the acoustic system 30 is different from the acoustic system 10 in that it includes planar speakers 210A and 210B. As shown in FIG. 8, the flat speaker 210A of the acoustic system 30 outputs the first sound to one side (for example, the right ear) of the listener, and the flat speaker 210B is output to the other side (for example, the left ear) of the listener. It arrange | positions so that the sound of 2 may be output. In other words, the support unit 230 has the frame 220 such that the flat speaker 210A outputs a first sound toward one side of the listener and the flat speaker 210B outputs a second sound toward the other side of the listener. Support. Further, as shown in FIG. 8, the flat speaker 210A and the frame 220A are supported by the first support member 231A so as to be rotatable about the connecting portion 236A, and the flat speaker 210B and the frame 220B have the connecting portion 236B as an axis. It is supported by the first support member 231B so as to be able to rotate and move. The rotationally movable regions of the flat speakers 210A and 210B include a range in which each surface is parallel to the surface of the floor 110, and is parallel to the first support members 231A and 231B and the second support member 232 when stored. You can also. Here, the flat speaker 210A is arranged so that the normal direction of the surface of the flat speaker 210A is positioned on one side of the listener, and the flat speaker 210B is the normal of the surface of the flat speaker 210B on the other side of the listener. You may arrange | position so that a direction may be located.

  The flat speaker 210A and the flat speaker 210B may output the sound of the musical instrument played by the listener separately to the left and right. The sound of the musical instrument played by the listener may be output from the flat speaker 210A, and the sound different from the musical instrument played by the listener may be output from the flat speaker 210B. For example, performance music or performances of other performers may be output from the flat speaker 210B. In addition, you may make it output from both the flat speaker 210A and the flat speaker 210B, without distinguishing a listener's performance, the performance of another player, a performance music, etc. In addition, although FIG. 8 illustrates an acoustic system in which two flat speakers are installed, the number of speakers may be three or more. For example, the plurality of speakers may be arranged in the left-right direction in FIG. 8, or may be arranged in the front-rear direction in FIG.

  As described above, according to the acoustic system according to the third embodiment of the present invention, the acoustic system can be installed on the upper part of the listener who is not disturbed without damaging the interior of the room. By installing an acoustic system above the listener, more natural instrument sounds can be provided. In addition, since different sounds are output from each of the flat speaker 210A and the flat speaker 210B, various sounds can be provided to the listener.

<Embodiment 4>
The outline of the acoustic system according to the fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, an acoustic system in which a curved surface speaker (curved speaker) is installed and the sound output from the curved speaker is concentrated on the listener will be described.

[Configuration of Acoustic System 40]
FIG. 9 is a cross-sectional view of an acoustic system according to Embodiment 4 of the present invention. The acoustic system 40 illustrated in FIG. 9 is similar to the acoustic system 10 illustrated in FIG. 3, but the acoustic system 40 is different from the acoustic system 10 in that it includes a curved speaker 400 and a frame 410. As shown in FIG. 9, the frame 410 is provided with an opening 411 and is curved so that the surface side provided with the opening 411 has a concave shape. That is, in FIG. 9, the curved surface of the curved speaker 400 has a concave shape in the direction of the floor 110. Since the sound wave output from the curved speaker 400 to the outside of the frame 410 through the opening 411 is gradually concentrated, a sound wave having a higher density than the output surface of the curved speaker 400 is formed. That is, the sound wave density is higher in the vicinity of the listener than in the vicinity of the output surface of the curved speaker 400, and the sound is louder.

  9 illustrates a configuration in which the curved speaker 400 and the frame 410 have a concave shape on the surface side provided with the opening 411. However, the configuration is not limited to this configuration. For example, the surface side provided with the opening 411 has a convex shape. You may have. Since the surface side provided with the opening 411 has a convex shape, the sound wave output from the speaker travels while spreading, so that a plurality of listeners can listen.

  As described above, according to the acoustic system according to Embodiment 4 of the present invention, it is possible to install the acoustic system on the upper part of the listener who is not disturbed without damaging the interior of the room. By installing an acoustic system above the listener, more natural instrument sounds can be provided. In addition, since the curved speaker 400 has a convex shape in the ceiling direction, sound waves can be concentrated on the listener, and even if the sound output from the curved speaker 400 is small, it is sufficiently large for the listener. Sound can be provided. Furthermore, since the sound wave reflected from the floor 110 gradually spreads and the density of the sound wave becomes low, the sound leaking outside can be made smaller than the sound transmitted to the listener.

<Embodiment 5>
The outline of the acoustic system according to the fifth embodiment of the present invention will be described with reference to FIGS. 10 and 11. In the fifth embodiment, an acoustic system in which a support unit that supports a speaker and a frame is supported only on the floor 110 side will be described. 10 and 11 show an example in which the acoustic system is installed in a space where the ceiling is not provided, but of course, it may be installed inside a room having a floor and a ceiling.

[Configuration of Acoustic System 50]
FIG. 10 is a cross-sectional view of an acoustic system according to Embodiment 5 of the present invention. In the acoustic system 50 shown in FIG. 10, the flat speaker 210 and the frame 220 are supported by an arch-shaped support portion 440 connected to a plurality of lower pads 234. That is, the acoustic system 50 is fixed so as to be movable in a space having a floor. FIG. 11 is a cross-sectional view of an acoustic system according to a modification of the fifth embodiment of the present invention. In the acoustic system 51 shown in FIG. 11, the flat speaker 210 and the frame 220 are supported by a curved support portion 450 connected to the lower pad 234. That is, the acoustic system 51 is fixed to be movable in a space having a floor. Here, the lower pad 234 of the acoustic system 51 extends long in the direction in which the flat speaker 210 and the frame 220 are installed. In addition, a signal receiving device 240 is installed on the side opposite to the side on which the flat speaker 210 and the frame 220 are installed. By doing in this way, it can suppress that the acoustic system 51 inclines or falls by the weight of the flat speaker 210 and the flame | frame 220. FIG. 10 and 11, the frame 220 may be supported so as to be rotatable with the support portions 440 and 450 so as to include a range in which the surface of the flat speaker 210 and the surface of the floor 110 are parallel to each other. . Further, in order to make the orientations of the flat speaker 210 and the frame 220 variable, the support portions 440 and 450 may have movable portions.

  As described above, according to the acoustic system according to the fifth embodiment of the present invention, the acoustic system can be installed on the upper part of the listener who is not disturbed without damaging the interior of the room. By installing an acoustic system above the listener, more natural instrument sounds can be provided. In addition, since the acoustic system can be installed without using the ceiling 120, the acoustic system can be installed even in a room where the ceiling is very high and difficult to install on the ceiling.

[Configuration of Acoustic System 60]
FIG. 12A is a cross-sectional view of an acoustic system according to Embodiment 6 of the present invention. FIG. 12B is a perspective view showing the configuration of the speaker in the acoustic system according to Embodiment 6 of the present invention. In FIG. 12A, the first support member 231, the frame 220, and the flat speaker 210 are shown in an enlarged manner. In FIG. 12B, the frame 220 and the first support member 231 are omitted. In the acoustic system 60 shown in FIG. 12 (FIGS. 12A and 12B), the flat speaker 210 includes a vibration unit 211 and a sound insulation unit 212.

  Between the vibration part 211 and the sound insulation part 212, a support column 214 is disposed to maintain the distance between them. That is, the vibration part 211 and the sound insulation part 212 are connected by the support column 214. A space 216 is provided between the vibration unit 211 and the sound insulation unit 212 by the support column 214. As shown in FIG. 12B, the support column 214 is disposed near the corners of the vibration unit 211 and the sound insulation unit 212 (planar speaker 210). Further, as shown in FIG. 12A, an opening 222 is provided on the side surface of the frame 220. That is, the space 216 is connected to the external space in the side surface direction (the side surface direction of the flat speaker 210). In other words, a part of the sound wave emitted from the vibration unit 211 in the direction of the sound insulation unit 212 is transmitted from the side surface of the space 216 to the external space.

  Here, FIG. 12 illustrates a configuration in which the support column 214 is disposed in the vicinity of the corner portion of the flat speaker 210, but the configuration is not limited to this configuration. For example, the column 214 may be disposed near the side of the flat speaker 210. Further, when the planar shape of the flat speaker 210 is circular, the columns 214 only need to be arranged at intervals, and the arrangement position of the columns 214 can be freely designed. Further, if it is not necessary to perform sound insulation on the ceiling side, the sound insulation part 212 and the support column 214 may not be provided.

  As described above, according to the acoustic system according to the sixth embodiment of the present invention, the acoustic system can be installed on the upper part of the listener who is not disturbed without damaging the interior of the room. In addition, since a space 216 is provided between the vibration unit 211 and the sound insulation unit 212 and the side surface of the space 216 is open, a sound wave emitted from the vibration unit 211 in the floor direction and a sound wave emitted in the ceiling direction. The sound wave traveling in the direction of the side surface of the speaker 210 can be weakened by the interference. Therefore, an acoustic system with higher directivity can be obtained. The above-described effect is particularly noticeable in a sound wave of about 1 kHz or less that has a low directivity and is close to a spherical wave.

<Modification 1 of Embodiment 6>
FIG. 13A is a cross-sectional view of an acoustic system according to Modification 1 of Embodiment 6 of the present invention. FIG. 13B is a perspective view showing a configuration of a speaker in the acoustic system according to Modification 1 of Embodiment 6 of the present invention. The acoustic system 61 shown in FIGS. 13A and 13B (FIG. 13) is similar to the acoustic system 60 shown in FIG. 12, but the acoustic system 61 is different in that the frame 220 and the sound insulation unit 224 are integrally formed. Different from the acoustic system 60.

  As shown in FIG. 13A, the vibration part 211 is supported by the frame 220. On the ceiling side of the vibration part 211, a sound insulation part 224 formed integrally with the frame 220 is disposed. The frame 220 and the sound insulating part 224 are connected by a flat connection part 226 provided with an opening 222. As illustrated in FIG. 13B, the connection portion 226 is disposed so as to surround the vibration portion 211. That is, the connection part 226 is disposed on the four surfaces around the vibration part 211.

  Here, FIG. 13 illustrates a configuration in which the frame 220, the sound insulating portion 224, and the connection portion 226 are integrally formed, but the configuration is not limited thereto. For example, the frame 220, the sound insulation unit 224, and the connection unit 226 may be formed as individual components and bonded or bonded together. Further, in FIG. 13, the connection unit 226 is exemplified as the configuration arranged on the four surfaces around the vibration unit 211, but is not limited to this configuration, and may be arranged on at least one surface around the vibration unit 211. That's fine.

<Modification 2 of Embodiment 6>
FIG. 14A is a cross-sectional view of an acoustic system according to Modification 2 of Embodiment 6 of the present invention. Moreover, FIG. 14B is a perspective view which shows the structure of the speaker in the acoustic system which concerns on the modification 2 of Embodiment 6 of this invention. The acoustic system 62 shown in FIGS. 14A and 14B (FIG. 14) is similar to the acoustic system 61 shown in FIG. 13, but the acoustic system 62 has a connecting portion 226 arranged on one side of the vibrating portion 211. The other directions differ from the acoustic system 61 in that they are open.

  As shown in FIG. 14, the frame 220 and the sound insulation unit 224 are connected only by a connection unit 226 arranged on one side of the vibration unit 211. In other words, it can be said that the sound insulating portion 224 is supported by the frame 220 in a cantilever structure.

  Although FIG. 14 illustrates the configuration in which the opening 222 is provided in the connection portion 226, the configuration is not limited to this configuration. For example, the frame 220 and the sound insulation unit 224 may be connected by a connection unit 226 in which the opening 222 is not provided. Further, in FIG. 14, the configuration in which the frame 220 and the sound insulating unit 224 are connected only by the connection unit 226 is illustrated, but the configuration is not limited thereto. For example, the support column 214 shown in FIG. 12 may be further disposed between the frame 220 and the sound insulation unit 224.

  As described above, according to the acoustic system according to the modification of the sixth embodiment of the present invention, the acoustic system can be installed on the upper part of the listener who is not disturbed without damaging the interior of the room. Moreover, since an acoustic system can be comprised with fewer members, an assembly can also be simplified and the cost of an acoustic system can be reduced.

  Here, in the first to sixth embodiments, the configuration in which the support portions 230, 270, 440, and 450 support the side portions and the upper portions of the frames 220 and 410 has been illustrated, but for example, two adjacent portions extending in the horizontal direction or A structure in which more support portions are arranged and a frame is stretched between them may be used. That is, two or more adjacent support portions extending in the horizontal direction may support the frame from below. Moreover, the structure which supports a flame | frame from the downward direction in two places or more may be sufficient as one support part 230,270,440,450 branches. Here, when installing the 2nd support member 232 between the opposing walls 130, the 1st support member 231 does not need to be provided, for example, it is arrange | positioned in proximity between the opposing walls 130, 2 A configuration in which a frame is stretched between two or more second support members 232 may be employed.

  Hereinafter, the acoustic system which concerns on Embodiment 6 of this invention is produced, and the result of having evaluated the directivity of the sound wave discharge | released from the vibration part is demonstrated concretely. Here, Example 1 below is a result of an evaluation sample using the acoustic system 60 according to Embodiment 6, and Example 2 has a shape in which the end portions of the vibration part 211 and the sound insulation part 212 are covered with the side surface 228. It is a result of an evaluation sample.

  FIG. 15 is a diagram showing an outline of an evaluation sample shape according to the embodiment of the present invention. FIG. 15A shows the evaluation sample shape of Example 1, and FIG. 15B shows the evaluation sample shape of Example 2. Here, in FIG. 15, for convenience of explanation, only the vibration unit 211, the sound insulation unit 212, and the frame 220 are displayed (the sound insulation unit in FIG. 15B is disposed inside the frame 220).

  As shown in FIG. 15, the evaluation samples of Example 1 and Example 2 were designed so that their outer dimensions were the same. That is, the difference between the first embodiment and the second embodiment shown in FIG. The outer dimensions of the evaluation sample are 750 mm in length, 535 mm in width, and 60 mm in depth. Here, since the thickness in the depth direction of the vibration part 211 and the sound insulation part 212 is 5 mm, the distance between the vibration part 211 and the sound insulation part 212 is 50 mm. The dimensions of the vibration part 211 exposed from the frame 220 are 650 mm in length and 435 mm in width. Here, the sound insulation part 212 and the frame 220 were produced using cardboard.

  FIG. 16 is a diagram for explaining an evaluation method according to an embodiment of the present invention. As shown in FIG. 16, the evaluation of the example was performed by installing microphones 500 at two locations and measuring the volume of sound emitted from the flat speaker 210. The microphone 500-1 is installed at a position 500 mm away from the end of the flat speaker 210 between the vibration unit 211 and the sound insulation unit 212. Further, the microphone 500-2 is installed at a position 500 mm downward from the center of the vibration unit 211. A sound having a frequency of 100 Hz to 1000 Hz was output to the vibration unit 211, and the volume was measured with the microphone 500.

  17 and 18 are diagrams showing the evaluation results of the examples of the present invention. FIG. 17 shows volume data measured by the microphone 500-1, and FIG. 18 shows volume data measured by the microphone 500-2. 17 and 18, solid line data (data 510, 530) is the evaluation result of the first embodiment, and dotted line data (data 520, 540) is the evaluation result of the second embodiment.

  As shown in FIG. 17, it was confirmed that the sound pressure of the data 510 is smaller than that of the data 520. In other words, the volume released in the side surface direction of the flat speaker 210 can be suppressed smaller in the first embodiment than in the second embodiment. This is because the sound that diffracts from the upper side of the flat speaker to the side is more likely to be emitted from the side of Example 1 that is open to the side than Example 2 that is closed to the side. This is because the sound waves diffracting from the lower side to the side weaken as a result. On the other hand, as shown in FIG. 18, it is confirmed that the data 530 and the data 540 have substantially the same size regardless of the frequency, and the sound emitted in the normal direction of the flat speaker 210 is the same as that of the first embodiment. It was confirmed that there was almost no difference between Example 2. That is, it was confirmed that there is almost no difference between Example 1 and Example 2 regarding the sound pressure emitted from the flat speaker 210 to the listener side. Here, in part of the low frequency region of FIG. 17, the volume of the second embodiment is lower than that of the first embodiment. Further, a specific spectrum (a spectrum in which peaks and valleys appear alternately) appears in the region from 400 Hz to 1000 Hz in FIG. These are due to the influence of reflection or the like in the measurement environment, and are not essentially a result due to the difference between the first embodiment and the second embodiment.

  FIG. 19 and FIG. 20 are diagrams showing computer simulation results of acoustic radiation characteristics of the embodiment of the present invention. The simulation was performed with a 2 m × 4 m two-dimensional space as an analysis region and a flat speaker 210 disposed between the lower end and the upper end as shown in the figure. The numerical values shown in the figure indicate the sound pressure level at each observation point. A boundary line between different sound pressure levels is a line indicating an approximately intermediate value between adjacent sound pressure levels. The sound pressure level is shown as an absolute value in FIGS. That is, the sound pressure level 64 in FIG. 19 and the sound pressure level 64 in FIG. 20 are the same sound pressure level.

  Comparing the simulation results of Example 1 and Example 2, it was confirmed that Example 1 was suppressed lower than Example 2 in the sound pressure level in the side surface direction of flat speaker 210. On the other hand, regarding the sound pressure level on the sound insulating section 212 side of the flat speaker 210 (that is, the back surface side of the flat speaker 210), the second embodiment is lower than the first embodiment.

  From the above results, it was found that the evaluation sample of Example 1 has higher directivity than the evaluation sample of Example 2. Therefore, it has been found that the structure shown in Example 1 is suitable for realizing the flat speaker 210 with high directivity.

  On the other hand, when it is desired to suppress sound leakage to the back side of the flat speaker 210, as shown in Example 2, it has been found that the flat speaker 210 having the side surface 228 can be considered as one of the realizing methods.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

10, 11, 20, 21, 30, 40, 50, 51, 60, 61, 62: acoustic system, 100: room, 110: floor, 120: ceiling, 130: wall, 210: flat speaker, 211: vibration section 212, 224: sound insulation part, 214: support, 216: space, 220, 410: frame, 222: opening, 226: connection part, 230, 270, 440, 450: support part, 231: first support member, 232: second support member, 233: upper pad, 234: lower pad, 235, 236: connection unit, 240: signal receiving device, 241, 322: amplifier circuit, 242: D / A converter, 243: communication unit, 250 : Base, 260: Hook ceiling, 280: Duct rail, 281: Connector , 310: Electric violins, 320: signal transmission apparatus, 321: sound collection unit, 323: A / D converter, 324: Pickup, 400: curved speaker, 500: microphone, 510, 520, 530, 540: Data

Claims (11)

A planar speaker that outputs directional sound waves;
A frame that supports the speaker;
A support portion that is movably fixed in a first space having a floor and supports the frame;
The acoustic system according to claim 1, wherein the support unit supports the frame so that the speaker outputs the sound wave toward the floor.   The acoustic system according to claim 1, wherein the support unit movably supports the frame in a predetermined range including a range in which a surface of the speaker and the floor are parallel to each other. The support part has a first fixing part and a second fixing part,
The distance between the first fixed part and the second fixed part is variable,
The first fixing portion is fixed to a first surface in the first space, and the second fixing portion is fixed to a second surface in the first space. Acoustic system.   The acoustic system according to any one of claims 1 to 3, wherein the frame is opened in a side surface direction of the speaker. The speaker has a vibration part and a sound insulation part,
The second space between the vibration part and the sound insulation part is connected to the first space in a side surface direction of the speaker with respect to the second space. The acoustic system described in 1.   The acoustic system according to claim 5, wherein the vibration unit and the sound insulation unit are connected by a support column.   The acoustic system according to claim 5, wherein the vibration unit and the sound insulation unit are connected by a flat plate provided with an opening.   The acoustic system according to claim 7, wherein the flat plate is disposed on one side of the vibration part and the sound insulation part. The support part is detachable from a hooking closet or hooking ceiling provided on the ceiling and capable of supplying power,
The sound system according to any one of claims 1 to 8, wherein the speaker outputs sound by electric power supplied from the rosette or the ceiling. The speaker includes a first speaker and a second speaker,
The support unit is configured so that the first speaker outputs a first sound toward one side of the listener, and the second speaker outputs a second sound toward the other side of the listener. The sound system according to claim 1, wherein the sound system supports a frame. The speaker has a curved surface;
The acoustic system according to any one of claims 1 to 10, wherein the curved surface has a concave shape in the direction of the floor.

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